I have multiple divs on my website that are clickable. I simply want that when the user clicks this div, a class is then added so they know they have viewed this.

For example, we could have a list of 10 links on the site. Once they click a link, the 'viewed' class would be added, to set a background colour to green.

I know the below is a simply way to do this in jQuery, but if someone could please help with storing this in PHP it would help so much, I am quite stuck on this!

  <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
  <script src="https://code.jquery.com/jquery-3.5.0.min.js" integrity="sha256-xNzN2a4ltkB44Mc/Jz3pT4iU1cmeR0FkXs4pru/JxaQ=" crossorigin="anonymous"></script>
  <div class="clickable-links">
    <div class="link1">Lnk 1</div>
    <div class="link2">Lnk 2</div>
    <div class="link3">Lnk 3</div>

  .viewed {
    background: red;

  $(function() {
    $('.clickable-links > div').click(function() {

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